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SDR IXXA20220515111

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Service difficulty report · O-Ring · Boeing 767381

FAA SDR system

Difficulty date
May 15, 2022
Submitted
June 9, 2022
Operation
Air carrier
Aircraft
N431AZ
Make and model
Boeing 767381
Aircraft serial
24632
Aircraft time
83,629 hours, 36,813 cycles
Engine
Ge CF680C2B6
Engine time
90,184 hours, 16,944 cycles
System (JASC)
7900 · Engine Oil System (Airframe Furnished)
Part
O-Ring
Condition
Failed
Stage of operation
CR
How discovered
O
Nature of condition
J
Precautionary procedure
A, B, E

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

ENROUTE FROM KSFO TO KAFW AT CRUISE OIL PRESSURE WAS IN AMBER RANGE AT 29 PSI. OIL PRESSURE THEN DROPPED REACHING RED RANGE AT 10 PSI AT 20000 FEET. CREW SHUT DOWN RIGHT ENGINE IN FLIGHT. AIR TURN BACK TO KSFO WITH EMERGENCY DECLARATION. LANDING WAS UNEVENTFUL WITH NO ADDITIONAL PRECAUTIONARY ACTIONS NOTED. AIRCRAFT GROUNDED FOR UNSCHEDULED MAINTENANCE. AT CRUISE OIL PRESSURE WAS IN AMBER RANGE AT 29 PSI. OIL PRESSURE THEN DROPPED REACHING RED RANGE AT 10 PSI AT 20000 FEET. IN FLIGHT, CREW SHUT DOWN RIGHT ENGINE. AIR TURN BACK TO KSFO WITH EMERGENCY DECLARATION. LANDING WAS UNEVENTFUL WITH NO ADDITIONAL PRECAUTIONARY ACTIONS NOTED. ON ARRIVAL, AIRCRAFT GROUNDED FOR UNSCHEDULED MAINTENANCE. REMOVED AND REPLACED RIGHT ENGINE STARTER O-RING AND ENGINE DRIVEN PUMP CARBON GEAR BOX ACCESSORY SEAL. OPERATIONAL AND LEAK CHECK GOOD. AIRCRAFT RELEASED TO SERVICE.